Abstract
These angular diameter measurements of the discrete sources were the first to result in estimates of their brightness temperatures, and, together with concurrent measurements of their radio spectra, showed that the sources were non-thermal in physical nature. Identification with optical galaxies and a supernova remnant were able to fix their distances and thus their linear dimensions and total power outputs, the latter being so great that the generating mechanism remained obscure for some years. Nearer the Earth, interferometer measurements of scattered emission from discrete sources passing behind the Sun's extended corona outlined the large volume of interplanetary space that contained electron-density turbulence of sufficient strength to scatter their radiations and so increase their apparent angular diameters. The ultimate manifestation of coronal scattering was the discovery in 1963-1964 that the decametric radio bursts from Jupiter were, in fact, caused by the drifting of a scattered diffraction pattern across the receiving antennas at the speed of the solar wind.
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